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35
since December 2000. Between them, the
studies investigated any possible association
between the use of wireless phones and
primary brain cancer, glioma, meningioma,
or acoustic neuroma, tumors of the brain or
salivary gland, leukemia, or other cancers. None
of the studies demonstrated the existence of
any harmful health effects from wireless phone
RF exposures.
However, none of the studies can answer
questions about long-term exposures, since the
average period of phone use in these studies
was around three years.
5. What research is needed to decide
whether RF exposure from wireless
phones poses a health risk?
A combination of laboratory studies and
epidemiological studies of people actually
using wireless phones would provide some
of the data that is needed. Lifetime animal
exposure studies could be completed in a few
years. However, very large numbers of animals
would be needed to provide reliable proof
of a cancer promoting effect, if one exists.
Epidemiological studies can provide data that
is directly applicable to human populations,
but 10 or more years follow-up may be needed
to provide answers about some health effects,
such as cancer. This is because the interval
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